risti endriani arhatin - Academia.edu (original) (raw)

Papers by risti endriani arhatin

Optical system application in remote sensing data has good accuracy in inventory and monitoring o... more Optical system application in remote sensing data has good accuracy in inventory and monitoring of coastal land. The area that is always covered by clouds and cannot be detected using optical system is expected to be detected by the availability of the Radar system. In this study, we use Radar satellite image, which works on the C-channel. The purpose of this study are mangrove identification, filter selection and segmentation method selection of the Radar satellite data. The results are that the median filter (non-adaptive filter) is the best for mangrove identification or the gamma filter (adaptive filter). While, the best segmentation method is the median cut. Keywords: filter, mangrove, r adar satellite, segmentatio n

... sayang serta dorongan semangat kepada penulis selama ini. 2. Bapak Ir. Santoso Rahardjo, MSc,... more ... sayang serta dorongan semangat kepada penulis selama ini. 2. Bapak Ir. Santoso Rahardjo, MSc, Bapak Ir. Jonson Lumban Gaol, Msi, Ibu Dra. ... 6. Alm. Mas Budi dan Dik Aji yang penulis sayangi, atas doa yang tulus dan dorongan yang tak terputus kepada penulis. ...

RISTI ENDRIANI ARHATIN. Study on Vegetation Index Algorithm and Classification Model for Mangrove... more RISTI ENDRIANI ARHATIN. Study on Vegetation Index Algorithm and Classification Model for Mangrove Derived from Landsat TM and ETM+ (Case Study at Kabupaten Berau, East Kalimantan). Under the direction of VINCENTIUS P. SIREGAR and RICHARDUS F. KASWADJI. To monitor mangrove using conventional method is very difficult, due to the hard and tough field of mangrove forest that be a big obstruction. Remote sensing which is able to cover a large area of mangrove might become a promising alternative to answer the problem. The objectives of this study are to validate the accuracy of remote sensing data, namely Landsat TM and ETM+ images, and for estimating mangrove forest canopy. This study compares two classification methods, i.e., maximum likelihood and neural network back propagation classifiers. The result shows that the best vegetation index algorithm is Green Normalized Difference Vegetation Index (GNDVI). PCA Result is {2,5180 (0,522x2 – 0,497x3 – 0,470x4 – 0,510x5)} + {1,3057 (-0,462x...

Selection of wrong location fishponds will cause the problems, such as increasing the cost of con... more Selection of wrong location fishponds will cause the problems, such as increasing the cost of construction, operational, and may cause environmental degradation. The purpose of this study was to evaluate the land suitability for shrimp farms considering the coastal and river border planning maps in Kecamatan Cijulang and Parigi. This study uses the Geographic Information Systems (GIS) to determine the level of compliance of existing shrimp farms in the area. The parameters taken into calculated are: land use; soil texture; soil type; land slope; distance from the river; distance from the shore; water pH, and salinity. The result of the spatial analysis was added by limiting factor coastal and river border, so the extensive shrimp farms area is 23.8 ha divided into three classes of suitability, namely very accordance (11.7 ha or 49.0%); accordance (1.0 ha or 4.3%), and not in accordance (11.1 ha or 46.6%). There are no shrimp farms in the area of conditional suitability. The existing...

Jurnal Ilmu Pertanian Indonesia, 2007

Accurate and up-to-date information of marine resources is needed for optimum resource utilizatio... more Accurate and up-to-date information of marine resources is needed for optimum resource utilization. If the required information cannot be obtained with traditional field surveys, remote sensing as a tool for providing fast, efficient, and accurate information is used to detect the changes. The study aims to use remote sensing data for assessing distribustion and condition of marine resources in Nias water's before and after tsunami. Marine resources pararameter derived remote sensing data are sea surface temperature (SST), suspended solid matter, chlorphyll-a concentration, coral reef and mangrove distributions. Mapping and differences in coral reef and mangrove distribution were evaluated using two scans of Landsat image in 1989 and 2005. Sea surface temperature was derived from NOAA-AVHRR data, and chlorophyll-a concentration was derived from SeaWiFS data. The study showed that there were no significant changes of coral reef and mangrove distribution, SST, chlorophyll-a concen...

Kelangkaan data spasial kelautan merupakan permasalahan mendasar dalam perencanaan pembangunan ke... more Kelangkaan data spasial kelautan merupakan permasalahan mendasar dalam perencanaan pembangunan kelautan di negara berkembang seperti lndonesia. Untuk mengatasi permasalahan ini, teknologi inderaja menjadi salah-satu alternatif pilihan. Salah satu ekosistem laut yang mengandung kekayaan sumberdaya alam adalah ekosistem terumbu karang. Pemanfaatan data inderaja untuk pemetaan ekosistem terumbu karang telah diperkenalkan di lndonesia sejak tahun 90-an dan saat ini sudah umum digunakan di Indonesia. Namun demikian, data inderaja mempunyai keterbatasan untuk memetakan objek terumbu karang karena berada hingga kedalaman tertentu yang tidak ada penetrasi cahaya. Pola distribusi terumbu karang yang mengikuti geomorfologi dasar perairan sangat mempengaruhi hasil penginderaan. Hasil penelitian di kepulauan Una-una Togean menuniukkan bahwa interpretasi dari citra satelit tidak menggambarkan kondisi terumbu karang yang sesungguhnya. Kata Kunci: Data Spasial, Kelautan, Inderaja, Terumbu Karang ...

Jurnal Ilmu Pertanian Indonesia, 2014

The increasing use of fish agregating devices (FADs) in the Indian Ocean South Coast of Java is c... more The increasing use of fish agregating devices (FADs) in the Indian Ocean South Coast of Java is concerned that will be affect the sustainability of tuna resources. The research aimed to evaluate and make development model of FADs as a tool in the sustainability utilization of tuna fish resources. Research was conducted in PPP Tamperan and PPP Pondokdadap. The evaluation was conducted to 1) the lengths size composition, 2) tuna stok resources, 3) map location of FADs, 4) policy rules of use of FADs. Evaluation results indicated 1) the size composition of decent catch tuna fish in PPP Tamperan and PPP Pondokdadap differed for sampling in different month, i.e. respectively in June-July 75,14 and 99,42%, while in August-September 43,18 and 73,43% respectively; 2) estimation of MSY is 2.569 tonnes per year, the optimum effort of 970 units, the level of utilization is 78,81; 3) FADs installed in position 8-13 o LS, 111-113 o BT, the number of FADs quite a lot with the installation distanc...

The existence of tuna fish is influenced by environmental factors, such as sea surface temperatur... more The existence of tuna fish is influenced by environmental factors, such as sea surface temperature and concentration of chlorophyll-a. Information of fishing season is essential in order to support the success of fishing activities. The Indian Ocean has potential resource of tuna fish, particularly bigeye and yellowfin. Most common way to catch tuna is by trolling. This study aimed 1) to describe fluctuation of tuna catch by trolling, 2) to map variability of sea surface temperature, and 3) to determine connection between tuna catch and sea surface temperature. The research was conducted in Indian Ocean Southern Coast of East Java. The data analyses were carried out through 1) analysis of fishing season index, 2) analysis to determine spatial and temporal distribution of sea surface temperature image 3) analysis of correlation between tuna catch and sea surface temperature. The result shows a pattern of tuna catch, which increasing in east season and decreasing in west season. Tuna ...

IOP Conference Series: Earth and Environmental Science, Jul 30, 2018

We analyzed the percentage of valid coastal altimetry Jason-2 X-TRACK-SLA data by Center for Topo... more We analyzed the percentage of valid coastal altimetry Jason-2 X-TRACK-SLA data by Center for Topographic Studies in Sea and Hydrosphere (CTOH) and the waveforms from the Sensor Geophysical Data Record (SDGR) that are distributed by NOAA National Ocean Data Center around the Indonesian waters. In general, the percentage of valid data after the first point of the shoreline is greater than 90%. The percentage of valid data in steeper waters (86%) is higher than sloping waters (34%). The waveform types formed in coastal waters are peaky and Brown. However, spatially there is a difference where in a steep coast at a distance of > 5 km from the coastline the type of waveform is identified Brown, while on the sloping coast the brown type is found at a distance > 10 km. The SLA time series indicate seasonal variations in which the SLA is negative during the Southeast Monsoon (May-October) and positive during Northwest Monsoon (November-April).

IOP Conference Series: Earth and Environmental Science

The Egyptian Journal of Aquatic Research

Abstract The Indonesian Fisheries’ Management of the Indian Ocean (FMA 573) has great tuna resour... more Abstract The Indonesian Fisheries’ Management of the Indian Ocean (FMA 573) has great tuna resources, especially yellowfin and bigeye. There are various problems regarding activities of tuna fisheries in this area, and now is the time to initiate an integrated management. This research aims to evaluate the biological and technological aspects of tuna fishing activities in the FMA 573, and to design a management model on resources and fishing technology aspects of Indonesian tuna fisheries in the Indian Ocean area (FMA 573). Model design was carried out using the soft system methodology approach. The study resulted in identifying three problems regarding resources and six problems regarding the technological aspect. Finally, the model design of tuna fisheries management in the Indian Ocean (FMA 573) gave a solution for regulating the number of fishing effort in the Indian Ocean (FMA 573) as well as for realigning the use of FADs with its technical and implementation guidelines. Lastly, the study aimed at helping in building a system which is capable of guaranteeing the national implementation on the certification of competence for ship captains and crew through policymaking and budget allocation. The conceptual model was constructed based on the definition of RDs.

Jurnal Ilmu dan Teknologi Kelautan Tropis

Absorption coefficient measurement can be used in estimating water quality, optical characteristi... more Absorption coefficient measurement can be used in estimating water quality, optical characteristic of water column, and marine bio-optical models. The purposes of this research were to determine values and variability of sea surface absorption coefficient in the northeastern Gulf of Mexico (NEGOM) based on various seasons. The data were collected in spring, summer, and fall seasons in 1999-2000 with AC-9 instrument. The spatial distribution of absorption coefficient showed that relatively high values were generally found along the run off Missisippi, Mobile, Chochawati, Escambia, Apalachicola, and Suwannee rivers, as well as Tampa Bay. Meanwhile, relatively low values were found in offshore region. This pattern followed the distribution pattern of chlorophyll and CDOM. Based on the local region comparison of spectral average value of absorption coefficient, we found a significant difference (α = 95%) among regions with the highest value in the run off of the Mississippi and Mobile rivers, and the lowest value in the offshore region. Comparison of spectral average value of absorption coefficient among seasons at the three primary wavelengths (blue=440 nm, green=510 nm, and red=676 nm) also showed a significant difference (α = 95%) with the highest value during the summer 1999 (Su-99) and the lowest value during the spring of 2000 (Sp-00). Absorption coefficient values were influenced by oceanographic factors that varied in every season such as wind, surface currents, upwelling, the location and speed of the Loop Current, and the river discharge of fresh water into the NEGOM.

Jurnal Ilmu dan Teknologi Kelautan Tropis

Spectral measurements of remote sensing reflectance (R rs) of surface waters in the northeastern ... more Spectral measurements of remote sensing reflectance (R rs) of surface waters in the northeastern Gulf of Mexico were conducted in various seasons in 1999-2000 using Fieldspec Analytical Spectral Devices (ASD) Spectroradiometer. Filtering process was performed on the data to eliminate invalid data. In general, in coastal waters particularly near rivers mouth (water type-2) the R rs spectrals were relatively low at blue, maximum at green, and decreased to a minimum value at the red wavelength. In offshore waters (type-1), the general pattern of R rs spectrals were maximum at the blue wavelength and then continued to decline at the green wavelength until the minimum value at the red wavelength except during summer where R rs spectrals in most offshore area having the maximum value at the green wavelength due to the phytoplankton bloom as a result of freshwater intrusion from the Mississippi river. In general, the patterns and values of R rs were significantly different among seasons and locations. Results showed that R rs values at the blue wavelength (λ=400 nm) were generally higher in the spring than in other seasons ranging of 0.007-0.018 sr-1 in offshore waters and 0.004-0.015 sr-1 in coastal waters. During spring, Rrs values at the green wavelength (λ=500 nm) were also higher than in other seasons ranging of 0.005-0.013 sr-1 found in coastal waters. However, during summer in coastal waters, the maximum values of R rs spectrals were found in different green wavelength on different locations showed the differences in the type and composition of phytoplankton, organic materials, and suspension matters at those locations.

European Journal of Remote Sensing, 2015

Abstract We analyzed the variability of sea surface height anomaly (SSHA), and its relationship w... more Abstract We analyzed the variability of sea surface height anomaly (SSHA), and its relationship with Bigeye tuna catch in the eastern Indian Ocean (EIO) off of Java Island (Indonesia). Both time series of SSHA and Bigeye tuna HR show dominant signals corresponding to the annual and inter-annual variability. During the southeast monsoon the wind blows along southern coast of Java and produces coastal upwelling. This causes sea level to drop due to an offshore Ekman transport, and thermocline becomes shallower. During El Niño and Indian Ocean Dipole (IOD) positive phase, upwelling is more intense and a large cold eddy forms in the EIO off Java. Generally, Bigeye tuna HR tends to increase during upwelling seasons and becomes even higher during El Niño and the positive phase of the IOD. The increased Bigeye tuna HR during the southeast monsoon, El Niño and the IOD positive phase can be attributed to the shallower thermocline depth and the enhancement of biological productivity due to development of eddies and strong upwelling in the EIO. The spatial distribution of SSHA indicates that Bigeye tuna catches are abundant in the frontal regions between cold and warm eddies.

Jurnal Ilmu Pertanian Indonesia, 2007

Jurnal Ilmu Pertanian Indonesia, 2014

IOP Conference Series: Earth and Environmental Science, Jul 30, 2018

IOP Conference Series: Earth and Environmental Science

The Egyptian Journal of Aquatic Research

Jurnal Ilmu dan Teknologi Kelautan Tropis

European Journal of Remote Sensing, 2015